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#include "UnixProcess.h"
#if defined(__WXGTK__) || defined(__WXOSX__)
#include <signal.h>
#include <string.h>
#include <sys/select.h>
#include <sys/types.h>
#include "file_logger.h"
#include <cl_command_event.h>
#include <processreaderthread.h>
#include <fileutils.h>
UnixProcess::UnixProcess(wxEvtHandler* owner, const wxArrayString& args)
: m_owner(owner)
{
m_goingDown.store(false);
child_pid = fork();
if(child_pid == -1) { clERROR() << _("Failed to start child process") << strerror(errno); }
if(child_pid == 0) {
// In child process
dup2(m_childStdin.read_fd(), STDIN_FILENO);
dup2(m_childStdout.write_fd(), STDOUT_FILENO);
dup2(m_childStderr.write_fd(), STDERR_FILENO);
m_childStdin.close();
m_childStdout.close();
m_childStderr.close();
char** argv = new char*[args.size() + 1];
for(size_t i = 0; i < args.size(); ++i) {
std::string cstr_arg = FileUtils::ToStdString(args[i]);
argv[i] = new char[cstr_arg.length() + 1];
strcpy(argv[i], cstr_arg.c_str());
argv[i][cstr_arg.length()] = 0;
}
argv[args.size()] = 0;
int result = execvp(argv[0], const_cast<char* const*>(argv));
int errNo = errno;
if(result == -1) {
// Note: no point writing to stdout here, it has been redirected
clERROR() << "Error: Failed to launch program" << args << "." << strerror(errNo);
exit(EXIT_FAILURE);
}
} else {
// parent process
close(m_childStdin.read_fd());
close(m_childStdout.write_fd());
close(m_childStderr.write_fd());
// Start the reader and writer threads
StartWriterThread();
StartReaderThread();
}
}
UnixProcess::~UnixProcess()
{
Detach();
// Kill the child process (if it is still alive)
Stop();
Wait();
}
bool UnixProcess::ReadAll(int fd, std::string& content, int timeoutMilliseconds)
{
fd_set rset;
char buff[1024];
FD_ZERO(&rset);
FD_SET(fd, &rset);
int seconds = timeoutMilliseconds / 1000;
int ms = timeoutMilliseconds % 1000;
struct timeval tv = { seconds, ms * 1000 }; // 10 milliseconds timeout
int rc = ::select(fd + 1, &rset, nullptr, nullptr, &tv);
if(rc > 0) {
memset(buff, 0, sizeof(buff));
if(read(fd, buff, (sizeof(buff) - 1)) > 0) {
content.append(buff);
return true;
}
} else if(rc == 0) {
// timeout
return true;
}
// error
return false;
}
bool UnixProcess::Write(int fd, const std::string& message, std::atomic_bool& shutdown)
{
int bytes = 0;
std::string tmp = message;
const int chunkSize = 4096;
while(!tmp.empty() && !shutdown.load()) {
errno = 0;
bytes = ::write(fd, tmp.c_str(), tmp.length() > chunkSize ? chunkSize : tmp.length());
int errCode = errno;
if(bytes < 0) {
if((errCode == EWOULDBLOCK) || (errCode == EAGAIN)) {
std::this_thread::sleep_for(std::chrono::milliseconds(10));
} else if(errCode == EINTR) {
continue;
} else {
break;
}
} else if(bytes) {
tmp.erase(0, bytes);
}
}
clDEBUG() << "Wrote message of size:" << message.length();
return tmp.empty();
}
int UnixProcess::Wait()
{
int status = 0;
waitpid(child_pid, &status, WNOHANG);
return WEXITSTATUS(status);
}
void UnixProcess::Stop()
{
if(child_pid != wxNOT_FOUND) { ::kill(child_pid, SIGTERM); }
}
void UnixProcess::Write(const std::string& message)
{
if(!m_writerThread) { return; }
m_outgoingQueue.Post(message);
}
void UnixProcess::StartWriterThread()
{
m_writerThread = new std::thread(
[](UnixProcess* process, int fd) {
while(!process->m_goingDown.load()) {
std::string buffer;
if(process->m_outgoingQueue.ReceiveTimeout(10, buffer) == wxMSGQUEUE_NO_ERROR) {
UnixProcess::Write(fd, buffer, std::ref(process->m_goingDown));
}
}
clDEBUG() << "UnixProcess writer thread: going down";
},
this, m_childStdin.write_fd());
}
void UnixProcess::StartReaderThread()
{
m_readerThread = new std::thread(
[](UnixProcess* process, int stdoutFd, int stderrFd) {
while(!process->m_goingDown.load()) {
std::string content;
if(!ReadAll(stdoutFd, content, 10)) {
clProcessEvent evt(wxEVT_ASYNC_PROCESS_TERMINATED);
process->m_owner->AddPendingEvent(evt);
break;
} else if(!content.empty()) {
clProcessEvent evt(wxEVT_ASYNC_PROCESS_OUTPUT);
evt.SetOutput(wxString() << content);
process->m_owner->AddPendingEvent(evt);
}
content.clear();
if(!ReadAll(stderrFd, content, 10)) {
clProcessEvent evt(wxEVT_ASYNC_PROCESS_TERMINATED);
process->m_owner->AddPendingEvent(evt);
break;
} else if(!content.empty()) {
clProcessEvent evt(wxEVT_ASYNC_PROCESS_STDERR);
evt.SetOutput(wxString() << content);
process->m_owner->AddPendingEvent(evt);
}
}
clDEBUG() << "UnixProcess reader thread: going down";
},
this, m_childStdout.read_fd(), m_childStderr.read_fd());
}
void UnixProcess::Detach()
{
m_goingDown.store(true);
if(m_writerThread) {
m_writerThread->join();
wxDELETE(m_writerThread);
}
if(m_readerThread) {
m_readerThread->join();
wxDELETE(m_readerThread);
}
}
#endif // OSX & GTK
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